Electric heater.



PATBNTED DEG. 31-, 1967." A. VQELKER. ELECTRIC HEATER. APPLICATION FILEDJUNE 6, l 906.

- lu WI AUGUST VOELKER, OF BERLIN, GERMANY.

ELECTRIC HEATER.

Specification of Letters Patent.

Patented Dec. 31, 1807.

Application filed June 6, 1906. Serial No. 320,421-

To all whom it may concern:

Be it known that I, A'ucusr VOELKER, a subject of the King of Prussia,residing at No. ,38 Oranienburgerstrasse, Berlin, German Empire, haveinvented new and useful. Improvements in Electric Heaters, of which thefollowing is a specification.

My invention relates to improvements in electric heaters or heatingcartridges.

The novelty of the present invention con sists in this that the electricheater or heating cartridge formed of a holder of refractory material,has a partition in its inside to form two compartments intended toreceive a coniminuted resistance material, current connections orterminals leading to each compartment at the lower part of thecartridge, a socket surrounding connections or terminals, said socketsbeing in one piece with the holder, a cover closing the upper extremityof said holder and a conducting bridge below said cover.

As a resisting material the granular non continuous resisting bodyobtained according to the process forming the object of my U. S. PatentNo. 77099]. is suitable, as, through the proper selection of the size ofgrains and the proper composition it can very easily be arranged toradiate a gentle heat of about 80 to 90 degrees centigrade, andcertainly under 200 degrees ccntigrade.

The subject matter .of this invention is represented in an example onthe sheet of drawings annexed to my present specification.

Figure 1 shows, in longitudinal section, a normal heating cartridge madeaccording to this invention, with only one foot, that foot being formedlike the socket of an incandescent lamp. Fig. 2 is a cross section ofthe heati] g cartridge along the line A, B, of Fig. 1. Fig. 3 shows aform of the inven tion for a heating arrangement made by puttingtogether a number of such cartridges. My cartridge is provided with onlya single foot for receiving the two current connections, litted on theone end of the casing containing the resisting bod this foot can be madeas a screivjoint, a clamp, a bayonet joint, or the like, just like thesocket of an l l 1 l the outer end of said In this case there is theadvantage that the put in connection with an cartridge can be at anytime, and can be electric attachment switched on and ofi, just like anncandescent la'np.

Referring to Figs. 1 and 2 of the. drawings a holder a, of relractormaterial, such as porcelain, 'clay, or the H (e, contains the finegrained resisting material at. This holder is provided with a cover 0 onthe end opposite the foot I), and, if advisable, the holder can furtherbe covered with a metal envelop. In this form oi the invention theholder a is divided. into two sections or channels it it (Fig. 2), by apartition wall 9 made or fitted between the current connections 6, f,and. the cover 0. In virtue, of this arrangement the current from theone current connection runs towards the cover c oi the container, andthen with the assistance of a conducting bridge 1', it runs back fromthe cover to the other current connection.

In Fig. 3 there is shown a heating arrangement consisting of severalheating cartridges of the above described kind. These are fitted on abed plate 7c, which is provided with a suitable switch Z, the switchrendering it possible to switcl'i on heating cartridges in any desirednumber to correspond 'to any temporary requirements.

Instead of using only one socket for current connection, two or severalof these, say for example, four, can be fitted.

The new cartridge can be used for various purposes, for example as aheating element for stoves of various constructions.

l ljaving now particularly described my invention, what I claim as newand desire to secure by Letters Patent is:--

In a heating cartridge the combination of a holder a of refractorymaterial, a partition 9 in the inside of said holder so as to form twocompartments it, a comminuted resistance material cl contained. in saidtwo compartments, current connections or terminals :2, f leading to eachcompartment (2 at the lower part of the cart-ridge, a socket bsurrounding the out-er end 0 terminals, said with the holder exforemityof said holder a, 5 budge w below said cover 0, s

, set forth.

In Witness whereof I h f said current connection socket b ave hereuntosigned s01 my name this 2321 day of Mey, 1906, in the being in one piecepresence of two subscribing witnesses. a, a cover c-olosing the upperand a eomluctlng ubstsmc-ially as AUGUST VOELKER,

Witnesses WOLDEMAB HAUPT, HENRY HASPER.

